KMC Controls BAC-9300 Series, Installation Manual

BAC-9300 Series Controller Installation Guide 

4 925-019-02G

CONNECT POWER

NOTE: 

Follow all local regulations and wiring 

codes.

1. 

Connect a 24 VAC, Class-2 transformer to the 

black power terminal block

 of the controller.

A.  Connect the neutral side of the transformer 

to the controllers 

common terminal

⊥ 

17

.

B.  Connect the AC phase side of the 

transformer to the controllers 

phase 

terminal

∼ 

18

.

18

17

NOTE: 

Connect only one controller to each 

transformer with 12—24 AWG copper 

wire.

NOTE: 

Use either shielded connecting cables 

or enclose all cables in conduit to 

maintain RF emissions specifications.

NOTE: 

For more information, see 

Sample 

(BAC-9311) Wiring on page 7

 and the 

YouTube video 

KMC Conquest Wiring: 

BAC-9300 Series Unitary Controllers

.

POWER AND COMMUNICATION STATUS

The 

status LEDs

 indicate power connection and 

network communication. The descriptions below 

describe their activity during 

normal operation

 (at 

least 5 to 20 seconds 

after

 power-up/initialization 

or restart).

NOTE: 

If both the green READY LED and the 

amber COMM LED remain OFF, check 

the power and cable connections to the 

controller.

CONNECT (OPTIONAL) MS/TP NETWORK

1. 

For BAC-93x1/93x1C models (only), connect 

the BACnet network to the 

gray BACnet MS/

TP terminal block

15

.

15

NOTE: 

Use 18 gauge AWG shielded twisted 

pair cable with maximum capacitance 

of 51 picofarads per foot (0.3 meters) 

for all network wiring (Belden cable 

#82760 or equivalent).

A.  Connect the 

–A

 terminals in parallel with 

all other 

–A

 terminals on the network.

B.  Connect the 

+B

 terminals in parallel with all 

other 

+B

 terminals on the network.

C.  Connect the 

shields

 of the cable together 

at each device using a wire nut or the 

S

terminal in KMC BACnet controllers.

2.  Connect the cable shield to a good earth 

ground at 

one end only

.

NOTE: 

For principles and good practices 

when connecting an MS/TP network, 

see 

Planning BACnet Networks 

(Application Note AN0404A

).

NOTE: 

The EOL switch is shipped from the 

factory in the OFF position.

3.  If the controller is at either end of a BACnet 

MS/TP network (only one wire under the 

terminals), turn the 

EOL

switch

16

to 

ON

.

NOTE: 

For more information, see 

Sample 

(BAC-9311) Wiring on page 7

 and the 

YouTube video 

KMC Conquest Wiring: 

BAC-9300 Series Unitary Controllers

.

16